The Allis-Chalmers D-21 Series II Tractor represents a significant piece of agricultural machinery, produced between 1957 and 1962. Known for its robust build and engineering prowess, this tractor was designed for heavy-duty farm work, offering substantial horsepower and torque for its time. Its innovative features and reliable performance made it a valuable asset for farmers and agricultural operations seeking efficiency and durability in demanding field conditions. The D-21 Series II embodies the quality and agricultural heritage associated with the Allis-Chalmers brand, contributing to its standing in the industry. This comprehensive service repair manual provides in-depth coverage for the Allis-Chalmers Model D-21 Series II Tractor. It is meticulously designed to assist tractor owners, independent mechanics, and restoration enthusiasts in maintaining and repairing their equipment. The manual details procedures for engine, transmission, brakes, electrical systems, suspension, steering, cooling, fuel, and chassis components. It also includes essential information on periodic maintenance, lubrication, troubleshooting, disassembly and reassembly, and electrical wiring diagrams, enabling users to perform everything from routine service to complete overhauls with confidence. 🏷️ Basic Information Identification Make: Allis-Chalmers Model: D-21 Series II Vehicle Type: Tractor Codes Manual Product Name: Allis Chalmers Model D-21 series II Tractor All Service Repair Manual Download 👋 Introduction Market Position Target Audience: Tractor owners, independent mechanics, restoration enthusiasts. Key Features Benefits: Enables DIY repairs, cost savings, in-depth vehicle knowledge, convenience for anytime/anywhere repairs. Content Value: Provides detailed instructions for disassembly, reassembly, repair, servicing, and maintenance. 📋 Manual Details Coverage Areas Primary Coverage: Complete service and repair of the Allis-Chalmers Model D-21 Series II Tractor Secondary Coverage: General maintenance, troubleshooting, engine, transmission, brakes, electrical, suspension, lubrication, steering, cooling, fuel, emissions, engine control, chassis, body, restraints, axles. Page Count Estimated Page Count: Indeterminate (Digital Download) Manual Type Type: Service Repair Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine Service: Comprehensive repair and overhaul procedures for the engine. Transmission Service: Detailed service and repair for the transmission system. Brake System: Repair and maintenance of the tractor's braking system. Electrical System: Coverage of all electrical components and wiring. Suspension System: Service and repair information for the suspension components. Steering System: Procedures for steering system maintenance and repair. Cooling System: Detailed information on the cooling system's operation and repair. Fuel System: Service and repair of the fuel injection and fuel delivery systems. Emission Control: Information pertaining to emission control systems. Chassis Body: Repair and maintenance of the tractor's chassis and body components. Axle And Drive: Service procedures for the front and rear axles and drive components. Procedures Included Disassembly Reassembly: Step-by-step instructions for component disassembly and reassembly. Troubleshooting: Diagnostic procedures and solutions for common issues. Periodic Maintenance: Guidance on routine maintenance tasks and schedules. Lubrication: Specific lubrication points and fluid recommendations. Wiring Diagrams: Includes electrical wiring schematics for the tractor. Technical Depth Depth: Comprehensive, from basic maintenance to complete engine and transmission rebuilds. 📊 Manual Specifications File Format File Type: PDF Reader Requirement: Adobe PDF Reader Compression Requirement: WinZip (or equivalent) Compatibility Operating Systems: All versions of Windows & Mac Print Quality Quality: High-resolution, suitable for printing. Binding Type Binding: N/A (Digital Download) Paper Type Paper: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Type: Diesel (typically Waukesha) Engine Displacement: Estimated 339.8 cubic inches (5.57 L) - requires specific engine variant confirmation. Performance Horsepower: Approx. 75 HP (drawbar) - varies by specific engine and tuning. Torque: Specific torque figures not readily available without model variant details, but expected to be substantial for heavy-duty work. Fuel System Injection System: Diesel Injection (likely Bosch or Simms, depending on exact configuration). Fuel Type: Diesel Fuel 🔧 Transmission Standard Transmission Type: Manual (likely a constant mesh gearbox with multiple forward and reverse gears). Features Gear Selection: Typically features a range splitter or gear splitting mechanism for optimal power delivery in various field conditions. 📐 Dimensions Weights Operating Weight: Approximately 9,000 - 10,000 lbs (4,082 - 4,536 kg) - varies with options. Wheelbase: Approx. 92 inches (2337 mm) - requires specific measurement. 🛡️ Safety Features Active Features Braking System Type: Typically internal expanding shoe brakes on the rear axle, often hydraulically actuated with a mechanical parking brake. Passive Features Operator Station: Open station design; roll-over protection systems (ROPS) may be an aftermarket or later addition, not standard from original manufacture for all units. 💡 Technology Features Infotainment Features: N/A (Tractor technology of the era focused on functionality, not infotainment). Driver Assistance Features: N/A (Tractor technology of the era focused on mechanical systems). Connectivity Features: N/A (Tractor technology of the era focused on mechanical systems). 🔧 Maintenance Service Intervals Engine Oil Change: Typically every 100-250 operating hours, depending on operating conditions and oil type. Transmission Oil Change: Refer to manual for specific interval, often around 500-1000 hours for heavy-duty transmissions. Fluid Specifications Engine Oil Type: API CD or MIL-L-2104B or equivalent...